Water spray gun



FIG. 1 is a perspective view of water spray gun showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a bottom side view thereof; and,

FIG. 7 is a top side view thereof. 

The ornamental design for a water spray gun, as shown and described. 